I don't know that much about the subject but I had an image for a website I was optimising and the avif version was 10x smaller than the png version, even after

I don't know that much about the subject but I had an image for a website I was optimising and the avif version was 10x smaller than the png version, even after I'd run through the normal techniques to squeeze it down, and 3x smaller than the jpeg while still looking much better. That's a really significant saving. Making an image your wallpaper isn't something people do every day, going through an extra step is hardly onerous. And support will increase until it no longer matters.